Spark-arrester



(No Model.)

J. H. READER.

SPARK ARRESTER.

No. 358,986. Patented Mar. 8, 1887.

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UNITED STATES PATENT OFFICE.

JAMES H. READER, OF VVAYNESBOBOUGH, PENNSYLVANIA.

SPARK-ARRESTER.

SPECIFICATION forming part of Letters Patent No. 358,986, dated March 8,1857.

Applicatir n filed October 2, 1886. Serial No. 215,117. (No model.)

To all whom it may concern.-

Be it known that I, JAMES H. READER, a citizenofthe United States,residing at Waynesborough, in the county of Franklin, State ofPennsylvania, haveinvented certain new and useful Improvements inSpark-Arresters, of which the following is a specification, referencebeing had therein to the accompanying drawings.

My invention relates to means for arresting sparks as they issue fromthe furnaces ofsteamboilers, disintegrating and pulverizing them bycontact with up and down passages within the smoke-stack until they areextinguished and reduced to such degree of fineness as to becomeharmless so far as danger from tire is concerned.

This invention and its operation will flrstbe described, and then bespecifically pointed out in the claims.

In the drawings, Figure l is a vertical section of a smoke-stackconstructed in accordance with my invention. Fig. 2 is a verticalsection of the lower end of one of theinternal cones, taken at rightangles to the section in Fig. 1.

In said drawings, A represents the conical upper end of the smoke-stack,within which is placed the sheet-metal cone B, of smaller diameter andmore acute taper, but of substantially the same length, as the outerconical shell, A. It has its upper end secured to the latter by means ofrivets a, passing through thimbles a or through angle-irons, so as toleave a tapering circular passage, A, between them.

W'ithin the cone B, and wholly inclosed thereby, is a truncatedsheet-metal cone, G, that is again of smaller diameter and more acutetaper than said cone B, and has its upper end secured to the latter bymeans of rivets b,passing through thimbles b so as to leave a taperingcircular passage, 13 between them. To the upper end of the conical outershell, A, is secured the concave deflector D, having its inner edgeoverhanging the upper edge of the inner cone, G, to deflect the sparksinto the latter. Upon the top of the deflector Dis placed a ring, E,having its lower portion flaring outwardly and secured to saiddeflector.

As it is sometimes desirable to still further guard against the escapeof small sparks when the machine is to be usid among straw-stacks andother inflammable substances, in such cases a wire-netting cone, E",having its wide edge secured to a ring, e", is placed within the stackwith its point downward, and its ring 6* secured by easily-removablefastenings, as a few bolts, 6", to the ring E of the stack. upper edgeofthe cone B is slightly bent inwardly at b to facilitate the escape ofthefinelypulverized specks of coal with the smoke. The lower end of thecone B is cut off, and has pendent therefrom a hood, G, so secured tothis cone as to leave passages F between the hood and thelower edge ofthe cone for the passage of the large sparks out of the cone Bback intothe taper passage A of the-stack. The hood at the same time prevents theexhauststeam and smoke from passing directly up through the cones B andC.

In operation, the smoke and sparks are carried up between the shell Aand the cone B, and,as the passage A is taperingin cross-see tion fromthe lower end until it reaches the deflector, the sparks will strikewith' great force the under side of the deflector, and by their momentumbe driven down through the cone or receiving-chamber G and out of thebottom ofthe cone B into the hood G, and be drawn by the section of thedraft through the openings F and into the main stack, and be thrownagain against the deflector, and will go through the same operationuntilthey are broken fine enough to loose momentum and be carried upwith the smoke through the upper central opening of the stack and intothe outer air. A portion of the smoke and exhauststeam being directeddown into the cone 0 by the deflector D,will produce some pressure insaid cone, and consequently an upward current between the cones B and G,into which the small sparks will be forced and caused to circulate untilsmall enough to be carried with the smoke. The arrows on the drawingsshow the course of the sparks until they are broken up and extinguished.

The advantages obtained by inclosing the cone 0 wholly within the cone Bis to produce a long continuous passage and a current to carry thesparks against the walls of both cones, and by friction therewithpulverize and extin- The IOO

guish them; but I am aware that smoke-stacks have been provided withinternal hollow cones placed one above the other, and that one of thecones has even been made to enter partly within the other, and Ido notclaim that construction.

Having now fully described my invention, I claim- 1. A spark-arresterconsisting of the outer conical shell, A, having the inwardly-curveddeflector D secured to the top thereof and within said shell, the coneB, having an openingin its lower end and a hoodin front of said opening,in combination with the truncated cone 0, wholly within the middle cone,B, whereby passages are produced, substantially as and for the purposedescribed.

2. In a spark-arrester, the combination of the outer conical shell, A,havingthe inwardlycurved deflector Dsecured to the top thereof andwithin said shell, the cone 13, having its upper edge bent inwardly andan opening in

